Glacier Trek™ SPK outsole with 32 replaceable cleats per pair, provide excellent traction on ice and snow (NOT to be used on hard surfaces)500 Denier nylon upper with waterproof membrane2.5 mm polyurethane internal bootieCleat wrench included with convenient internal pocket to keep wrench handy and available to change cleats on the jobExtra-large gusset provides easy on/offPerma-sole for high tractionDurable and lightweight100% waterproofAdjustable buckle strap for a tight perfect fitIf wearing over a work or combat boot, select one size up